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      Reduced recombination and enhanced UV-assisted photocatalysis by highly anisotropic titanates from electrospun TiO2-SiO2 nanostructures

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      Author
      Babu, V. J.
      Vempati S.
      Ramakrishna, S.
      Date
      2014
      Source Title
      RSC Advances
      Print ISSN
      0204-62069
      Publisher
      Royal Society of Chemistry
      Volume
      4
      Issue
      53
      Pages
      27979 - 27987
      Language
      English
      Type
      Article
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      Abstract
      The surface areas of electrospun fibers/rice grain-shaped nanostructures of TiO2-SiO2 composites were further enhanced after transforming them into thorn or sponge shaped titanates via selective leaching of SiO2, which was reported by our group previously [RSC Adv., 2012, 2, 992]. In this study, we report on their application in photocatalytic activity (PCA) when juxtaposed with photoluminescence (PL). Two defect related bands are observed in PL and their origin is discussed in relation to calcination, crystallization and nucleation effects. The relative PL intensity for sponge shapes was the lowest and hence had the lowest radiative recombination, which suggests carrier trapping at defect centers. This enables the charge carriers to migrate to the surface and participate in the PCA. The results of PCA suggested that the sponge-shaped titanate exhibits the highest degradation rate among all samples. A plausible mechanism for the differences in PCA is proposed based on the variation in the defect-densities. This journal is © the Partner Organisations 2014.
      Keywords
      Degradation
      Nanostructures
      Photocatalysis
      Titanium dioxide
      Defect-related bands
      Degradation rate
      Electrospun fibers
      Nucleation effect
      Photocatalytic activities
      Plausible mechanisms
      Radiative recombination
      Selective leaching
      Titanium compounds
      Permalink
      http://hdl.handle.net/11693/26604
      Published Version (Please cite this version)
      https://doi.org/10.1039/c4ra03498h
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      • Nanotechnology Research Center (NANOTAM) 1006
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